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Wewaii [24]
3 years ago
14

In how many ways can president, vice-president, and secretary be chosen from 9 students?

Mathematics
2 answers:
Dominik [7]3 years ago
4 0

Answer:

The answer is 27

Step-by-step explanation:

This is because each person can have up to three roles, and there are 9 students. So you can form an array, or a table to show your values. so if you have 9 rows and 3 coulombs and you can have 27 crosses in the array.  

gogolik [260]3 years ago
4 0

Answer:

Step-by-step explanation:in how many ways can a president, vice president, and a secretary be chosen?... is it 12X11X10. Permutation of n things taken r at a time: nPr=n!/(n-r)! 12P3=12*11*10*9!/9!= 12*11*10=1320 ways.

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Which proportion can be used to show that the slope of AC is equal to the slope of CE?
Gnesinka [82]

Slope is given by the expression:

m=\frac{y_2-y_1}{x_2-x_1}

We can equal both slopes of mAC and mCE

\begin{gathered} \frac{3-6}{-1-(-3)}=\frac{-3-3}{3-(-1)} \\  \\ \frac{-3}{2}=-\frac{6}{4} \\ -\frac{3}{2}=-\frac{3}{2} \end{gathered}

Answer is B.

5 0
1 year ago
A solution is heated from 0°C to 100°C. Between 0°C and 50°C, the rate of temperature increase is 1.5°C/min. Between 50°C and 10
muminat

Answer:

0.6 °C/min

Step-by-step explanation:

The relationship between rates and movement is ...

time = distance/speed

Here, the "distance" is measured in °C, and the "speed" is the rate of change of temperature.

For the first half of the heating, the time required is ...

(50°C -0°C)/(1.5 °C/min) = 50/(3/2) min = 100/3 min

For the second half of the heating, the time required is ...

(100°C -50°C)/(4/10 °C/min) = 50/(4/10) = 125 min

Then the total time is ...

((100/3) +125) min = (475/3) min

And the average rate of temperature increase is ...

total temperature change / total time

= (100°C -0°C)/(475/3 min) = 300/475 °C/min = 12/19 °C/min ≈ 0.6 °C/min

4 0
3 years ago
In ΔXYZ, m∠X = 90° and m∠Y = 30°. In ΔTUV, m∠U = 30° and m∠V = 60°. Which is true about the two triangles?
-Dominant- [34]
The best option is A. Both are right triangles.
6 0
4 years ago
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What is 67.5% as a fraction in simplest form
Dimas [21]

Answer:

27/40

Step-by-step explanation:

8 0
3 years ago
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12) Maxine went to the
Anna35 [415]
$0.29 * 3 = $0.87
$0.98 * 2 = $1.96
$1.39 * 1 = $1.39

0.87 + 1.96 = 2.83
2.83 + 1.39 = 4.22

10.00 - 4.22 = $5.78

she will get $5.78 back!
4 0
3 years ago
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